46 research outputs found

    A precise aperture centring device ACenD for autocollimator based surface measuring profilers

    No full text
    A new Aperture Centring Device ACenD for precisely positioning small apertures with respect to the autocollimator s optics has been developed. With the new device, differences in the angle response of autocollimators between the calibration at a laboratory and their subsequent application in the slope measuring profilers are significantly minimized. Evaluation of the device with a circular aperture size of d 2.5 mm was carried out in different laboratories. It was verified that the ACenD is capable of achieving a reproducible aperture alignment lt; 0.1 mm. The device is a substantial aid for the operation of slope measuring profilometers and enables the measurable, documentable, and transferable positioning of apertures that did not exist befor
    corecore